missing: OpenMP_C_FLAGS OpenMP_C_LIB_NAMES

missing: OpenMP_C_FLAGS OpenMP_C_LIB_NAMES

本文关键字：OpenMP NAMES LIB FLAGS missing      更新时间：2023-10-16

我正在使用Mac OSX上的OpenMP来编译项目。错误是：

CMake Error at /usr/local/Cellar/cmake/3.10.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
Could NOT find OpenMP_C (missing: OpenMP_C_FLAGS OpenMP_C_LIB_NAMES)
Call stack most recent call first) 
/usr/local/Cellar/cmake/3.10.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
/usr/local/Cellar/cmake/3.10.2/share/cmake/Modules/FindOpenMP.cmake:447 (find_package_handle_standard_args)
libRORPO/CMakeLists.txt:7 (find_package)

与项目中的openMP搜索关联的cmakelists文件如下：

# RORPO Lib
project(libRORPO)
cmake_minimum_required(VERSION 2.8)
# FIND OPENMP
find_package( OpenMP REQUIRED)
if(OPENMP_FOUND)
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} 
         ${OpenMP_EXE_LINKER_FLAGS}")
endif()
# ADD FILES
file(GLOB_RECURSE RORPO_HEADERS *.hpp *.h)
file(GLOB_RECURSE RORPO_SOURCES *.c)
add_library(RORPO ${LIB_TYPE} ${RORPO_SOURCES} ${RORPO_HEADERS})
install( FILES ${RORPO_HEADERS} DESTINATION include/libRORPO)
install( TARGETS RORPO DESTINATION lib)

我验证了OpenMP安装是否使用GCC-7和clang-opp运行良好。我搜索了类似的错误。响应指出，CMAKE中有一个最新软件包可以找到OpenMP。我重新安装了Cmake以拥有最新版本，但它仍然不起作用。我不是Cmake配置方面的专家。.，如果您可以指导我，我将不胜感激。

这是因为xcode clang不支持，请使用系统clang。

方法1：设置Env变量，然后运行CMAKEhttps://gist.github.com/svenevs/f00ed3898d2af6248921b63254aaaa8cc1 

export CC=/usr/local/opt/llvm/bin/clang
export CXX=/usr/local/opt/llvm/bin/clang++
export LDFLAGS="-L/usr/local/opt/llvm/lib"
export CPPFLAGS="-I/usr/local/opt/llvm/include"

method2：在cmakelists.txt

中设置env变量 
message(STATUS "set env var")
set(ENV{CC} "/usr/local/opt/llvm/bin/clang")
set(ENV{CXX} "/usr/local/opt/llvm/bin/clang++")
set(ENV{LDFLAGS} "-L/usr/local/opt/llvm/lib")
set(ENV{CPPFLAGS} "-I/usr/local/opt/llvm/include")

method3：在cmakelists.txt

中更改var 
message(STATUS "set compipler")
set(CMAKE_C_COMPILER "/usr/local/Cellar/llvm/5.0.1/bin/clang")
set(CMAKE_CXX_COMPILER "/usr/local/Cellar/llvm/5.0.1/bin/clang++")
set(OPENMP_LIBRARIES "/usr/local/Cellar/llvm/5.0.1/lib")
set(OPENMP_INCLUDES "/usr/local/Cellar/llvm/5.0.1/include")
set(OPENMP_LIBRARIES "/usr/local/opt/llvm/lib")
link_directories(${OPENMP_LIBRARIES})

方法4。在运行cmake

时更改Env变量 
cmake .. -DCC=xxx -DCXX=xxx -DLDFLAGS="" -DCPPFLAGS=""

我在基于ARM的MacOS机器上遇到了此问题，并安装Libomp修复了它：

arch -x86_64 brew install libomp

查找OpenMP

尽管到目前为止有其他答案，但可以使用系统编译器。

if(APPLE)
if(CMAKE_C_COMPILER_ID MATCHES "Clang")
    set(OpenMP_C "${CMAKE_C_COMPILER}" CACHE STRING "" FORCE)
    set(OpenMP_C_FLAGS "-fopenmp=libomp -Wno-unused-command-line-argument" CACHE STRING "" FORCE)
    set(OpenMP_C_LIB_NAMES "libomp" "libgomp" "libiomp5" CACHE STRING "" FORCE)
    set(OpenMP_libomp_LIBRARY ${OpenMP_C_LIB_NAMES} CACHE STRING "" FORCE)
    set(OpenMP_libgomp_LIBRARY ${OpenMP_C_LIB_NAMES} CACHE STRING "" FORCE)
    set(OpenMP_libiomp5_LIBRARY ${OpenMP_C_LIB_NAMES} CACHE STRING "" FORCE)
endif()
if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  set(OpenMP_CXX "${CMAKE_CXX_COMPILER}" CACHE STRING "" FORCE)
  set(OpenMP_CXX_FLAGS "-fopenmp=libomp -Wno-unused-command-line-argument" CACHE STRING "" FORCE)
  set(OpenMP_CXX_LIB_NAMES "libomp" "libgomp" "libiomp5" CACHE STRING "" FORCE)
  set(OpenMP_libomp_LIBRARY ${OpenMP_CXX_LIB_NAMES} CACHE STRING "" FORCE)
  set(OpenMP_libgomp_LIBRARY ${OpenMP_CXX_LIB_NAMES} CACHE STRING "" FORCE)
  set(OpenMP_libiomp5_LIBRARY ${OpenMP_CXX_LIB_NAMES} CACHE STRING "" FORCE)
endif()
endif()

我在以下位置找到了一个孔孔的解决方案：

诀窍是必须使用CC和CXX环境变量指向Clang-op的CMAKE：

CC=clang-omp CXX=clang-omp++ cmake

请注意，安装LLVM通过：

brew install llvm

并创建两个符号链接：

ln -s /usr/local/opt/llvm/bin/clang /usr/local/bin/clang-omp
ln -s /usr/local/opt/llvm/bin/clang++ /usr/local/bin/clang-omp++

使用@lbsweek提示：

它在映射啤酒安装LLVM之后对我有用。

是"/opt/homebrew/cellar/llvm/{version}＆quort"

一旦知道了，就可以映射OpenMP_C_Flags OpenMP_C_LIB_NAMES：

export CC=/opt/homebrew/Cellar/llvm/15.0.6/bin/clang
export CXX=/opt/homebrew/Cellar/llvm/15.0.6/bin/clang++
export LDFLAGS="-L/opt/homebrew/Cellar/llvm/15.0.6/lib"
export CPPFLAGS="-I/opt/homebrew/Cellar/llvm/15.0.6/include"
相关文章：